(1)The Director may at any time appoint a person who is not a Crown Prosecutor but who is—
(a)a solicitor ; or
(b)a barrister who is a member of the staff of a public authority;
to institute or take over the conduct of such criminal proceedings as the Director may assign to him.
(2)Any person conducting proceedings assigned to him under this section shall have all the powers of a Crown Prosecutor but shall exercise those powers subject to any instructions given to him by a Crown Prosecutor.